The surface of our teeth is covered with a layer of enamel, which is transparent or translucent, and the deep layer is dentin, which is light yellow. The color of healthy teeth is deep dentin, which is pale yellow through enamel.
Due to various reasons, such as drinking tea and smoking for a long time, or diseases such as pulp necrosis, tetracycline teeth and fluorosis, many people's teeth are yellow, black or dull. In medicine, this kind of tooth is commonly known as colored tooth, which affects people's daily life and physical and mental health.
Although there are many kinds of traditional whitening toothpastes, their whitening ingredients are almost the same except for their different taste and efficacy. For the sake of safety and hygiene, the content of oxidant in whitening toothpaste is very low, so the whitening effect is generally not obvious.
In addition, whitening toothpaste can only remove a very small amount of stains and exogenous pigments on the tooth surface, and basically has no effect on teeth with endogenous stains such as tetracycline teeth and dental fluorosis, so it is basically impossible to whiten teeth simply by toothpaste.
Extended data
The benefits of tea
1 to help dissipate heat.
In such hot weather, many people like to drink cold drinks to relieve the heat, but in fact, drinking cold things will contain the hot air and not easily radiate out of the body, leading to illness. If suspicious people want to quench their thirst and relieve summer heat in summer, they should drink some hot tea, sweat and quickly disperse the heat in their bodies.
Step 2 protect yourself from the sun
Green tea contains a component called catechin, which has a strong antioxidant effect. Catechins extracted from green tea can support skin care products, which can help skin resist the damage of sunlight when applied to the skin. Of course, drinking green tea directly also has a sunscreen effect.
Step 3 stop diarrhea
Tea can cooperate with garlic cloves to help stop diarrhea. Garlic has the function of detoxification and anti-inflammation, and tea can play the role of bacteriostasis, especially the inhibition of harmful bacteria in the intestine. The combination of tea and garlic can stop diarrhea well.
4, sterilization
Drinking some green tea every day can reduce the incidence of gastric ulcer, because green tea contains catechins, which can effectively inhibit Helicobacter pylori and help prevent gastric ulcer and duodenal ulcer.
People's Daily Online-Long-term drinking tea makes teeth yellow and whitening toothpaste has limited whitening effect.
People's Network-Drinking tea has four advantages, but the nature of "tea" depends on physical fitness.